54S140DM — TTL NAND Gate, Still in Active Production
The 54S140DM is a TTL NAND gate from the 54S series, a basic logic building block for combinational and glue-logic functions in digital systems. It is a single-gate device, intended for applications where a NAND function is needed without the overhead of a multi-gate package.
This is a key advantage for BOM stability — no last-time-buy risk to manage. Note that the part is RoHS non-compliant, so it is not suitable for assemblies that must meet RoHS/REACH substance restrictions.